Hello,
The case number looks like it's from the 1970's.
The movement number,which is only partly visible at the 10-11 o'clock postion is partly obscured by the screw head (which is missing a bit of itself).
Any way it looks like it starts with 622 but there should be 3 more digits. "622" would also put it in the 1970's. I would guess between 1969 and 1973 (but that's just an informed guess based on the numbers.
JB